260 ADDIT10N8 TO BEllWICKSHIRE KNTOMOSTRACA. 



dently the same as the specimens I found upon the sahnon 

 of the Tweed, and as Strom is tlic only author wlio seems 

 to have noticed it, I have namei it after him. 



Caligus Stromii — Strom, Kirbenhavn. Selskabs Skrifter, x. 

 23, t. 7, f 1—7. 



Female — Carapace oval the frontal plate somewhat pro- 

 minent, without sucking disks ; thorax about the same 

 length as the carapace, nam wer at upper extremity, broader 

 at posterior extremity and t<.rminating in two rounded lobes. 

 The horny tubercles on the medium line of the lower por- 

 tion of thorax above the vulva, large and simple. Abdomen 

 long and narrow, nearly as long as the thorax, terminating 

 in two lobes which give off several short, stout, i)lumose 

 setae. The sternal fork is short and simple. The oviferous 

 tubes are long. — Length of whole body (exclusive of tubes) 

 half an inch. 



Male — The male is much smaller than the female. The cara- 

 pace is oval, much larger in proportion to thorax than in fe- 

 male ; thorax narrow and posteriorly notched rather than 

 lobed on each side. Abdomen much shorter than in female, 

 terminating setae of caudal appendages longer and beautifully 

 plumose. About half the size of female. 



The Cal. Vespa (female) of M. Edwards is only 3 lines 

 long, and has the carapace narrow in front and very broad 

 posteriorly, while in this species the carapace is almost an 

 exact oval, and the animal (female) is fully half an inch in 

 length. In C. Vespa the horny tubercle at base of thorax is 

 small and setiferous, while in this species it is simple and of 

 considerable size. The Vespa is said by M. Edwards to have 

 been found in the gills of a salmon. This species I found on 

 different parts of the body of the fish ; and I have since then 

 received specimens from Dr. Johnston, who found them also 

 on the body of the salmon. M. Edwards does not appear to 

 have ever seen the male. 



